def get_waveform_info():
dpo.write('acquire:stopafter sequence')
dpo.write('acquire:state on')
dpo.query('*OPC?')
binaryFormat = dpo.query('wfmoutpre:bn_fmt?').rstrip()
print('Binary format: ', binaryFormat)
numBytes = dpo.query('wfmoutpre:byt_nr?').rstrip()
print('Number of Bytes: ', numBytes)
byteOrder = dpo.query('wfmoutpre:byt_or?').rstrip()
print('Byte order: ', byteOrder)
encoding = dpo.query('data:encdg?').rstrip()
print('Encoding: ', encoding)
if 'RIB' in encoding or 'FAS' in encoding:
dType = 'b'
bigEndian = True
elif encoding.startswith('RPB'):
dType = 'B'
bigEndian = True
elif encoding.startswith('SRI'):
dType = 'b'
bigEndian = False
elif encoding.startswith('SRP'):
dType = 'B'
bigEndian = False
elif encoding.startswith('FP'):
dType = 'f'
bigEndian = True
elif encoding.startswith('SFP'):
dType = 'f'
bigEndian = False
elif encoding.startswith('ASCI'):
raise visa.InvalidBinaryFormat('ASCII Formatting.')
else:
raise visa.InvalidBinaryFormat
return dType, bigEndian
def get_waveform_info(self):
"""Gather waveform transfer information from scope."""
self.inst.write('acquire:stopafter sequence')
self.inst.write('acquire:state on')
self.inst.query('*OPC?')
# dType is a single format character from Python's struct module
# https://docs.python.org/2/library/struct.html#format-characters
encoding = self.inst.query('data:encdg?').rstrip()
if 'RIB' in encoding or 'FAS' in encoding:
self.dType = 'b'
self.bigEndian = True
elif 'RPB' in encoding:
self.dType = 'B'
self.bigEndian = True
elif 'SRI' in encoding:
self.dtype = 'b'
self.bigEndian = False
elif 'SRP' in encoding:
self.dtype = 'B'
self.bigEndian = False
elif 'FP' in encoding:
self.dType = 'f'
self.bigEndian = True
elif 'SFP' in encoding:
self.dType = 'f'
self.bigEndian = False
elif 'ASCI' in encoding:
raise visa.InvalidBinaryFormat('ASCII Formatting.')
else:
raise visa.InvalidBinaryFormat
self.numPoints = int(self.inst.query('wfmoutpre:nr_pt?'))
self.xIncr = float(self.inst.query('wfmoutpre:xincr?'))
self.yMult = float(self.inst.query('wfmoutpre:ymult?'))
self.yOff = float(self.inst.query('wfmoutpre:yoff?'))